package com.lagou.decimal;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import java.io.IOException;

public class DecimalDriver {

    public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException {
        //        1. 获取配置文件对象，获取job对象实例
        Configuration conf = new Configuration();
        Job job = Job.getInstance(conf);
        //        2. 指定程序jar的本地路径
        job.setJarByClass(DecimalDriver.class);
        //        3. 指定Mapper/Reducer类
        job.setMapperClass(DecimalMapper.class);
        job.setReducerClass(DecimalReducer.class);
        //        4. 指定Mapper输出的kv数据类型
        job.setMapOutputKeyClass(DecimalBean.class);
        job.setMapOutputValueClass(NullWritable.class);
        //        5. 指定最终输出的kv数据类型
        job.setOutputKeyClass(IntWritable.class);
        job.setOutputValueClass(DecimalBean.class);
        //        6. 指定job处理的原始数据路径
        FileInputFormat.setInputPaths(job, new Path("D:\\data\\bigdata\\in"));
        //        7. 指定job输出结果路径
        FileOutputFormat.setOutputPath(job, new Path("D:\\data\\bigdata\\out"));
        //        8. 提交作业
        boolean result = job.waitForCompletion(true);
        System.exit(result ? 0 : 1);
    }
}
